EDIT: Uh oh. Looks like CSX is hedging their bets! Just got a photo sent to me of the new signals, and there are TWO MASTS. As you may know, they always mount Safetrans on the same mast where applicable, so this is very interesting. Eastbound one head, westbound two. Interestingly, sounds like they may have wired them right up to the old system.
Sounds like a quick replacement project rather than 'new' signals. Old ones may have suffered a failure, either electrical or structural, and needed to be replaced ASAP.
With the coming of PTC, and how anal the FRA is about additional layers of protection, it will be really tough for any railroad to abandon a signal system. That usually takes years to get permission to turn the lights off. Even the Hoosier Sub in Southern Indiana, which hasn't seen a through movement in years, is still required to have the signals on and tested. CSX filed to suspend service, but hasn't been granted permission to abandon the line. There has even been a bridge fire (arson) and storage cars were set loose, but yet the signals have to remain on.
Practice Safe CSX